Espresso Crema Membrane Macro

Create an extreme 3:2 macro photograph cropped entirely to the surface boundary between fresh espresso-black liquid and tawny crema. Build several irregular clusters rather than a uniform foam: dense fields of tiny cells taper into sparse edges, with a few larger transparent pockets nested between them. Give the large pockets extremely thin membranes, sharp curved highlights, and slight amber transmission, while the smallest cells hold tighter, softer highlights. Trace the crema edge through one controlled S-curve and allow black coffee, amber reflection, and a restrained cream tone to form layered marbling beneath it. Suggest surface tension only through the visible curvature and contact boundaries; do not add a scientific measurement or explanatory claim. Use raking light, very shallow depth of field, one crisp focal band, and natural falloff. Show no cup rim, machine, packaging, origin label, brand, hand, spoon, garnish, ingredient claim, recipe step, splash, steam plume, or café décor. If the image accompanies a product, require user-verified ingredients and allergen copy rather than generating it.